Bitcoin-Dev Mailing List Is Looking for New Home

"We'd like to invite feedback and proposals from the community, and see what options are available. One potential option is a migration to Google Groups, but we're open to ideas at this point. We apologize for any inconvenience this disruption has caused."

https://www.nobsbitcoin.com/bitcoin-dev-mailing-list-is-looking-for-new-home/